Name: Stainless Steel Top Diaphragm Cover Carb Bolts Kit - Hyosung GV125 GT125R GT125 GT250 GV250
SKU: 13385HG5100
Availability: InStock

Stainless Steel Top Diaphragm Cover Carb Bolts Kit – Hyosung GV125 GT125R GT125 GT250 GV250

Estimated delivery dates: Apr 23, 2026 - Apr 24, 2026

£4.99

💎 STAINLESS CARB DIAPHRAGM COVER BOLT KIT | NO MORE ROUNDED SCREWS

Banishing rusty OEM hardware for good. These Marine Grade A4 Stainless HEX bolts replace the soft, seize-prone factory screws. Designed for a lifetime of maintenance-free carb access and a custom “polished” look.

✅ Marine Grade A4: Superior corrosion resistance compared to standard steel.
🛠️ Hex Socket Design: No more rounding off; use an Allen key for a secure, easy grip.
⚙️ Direct Swap: Fits all carburetted 125cc & 250cc Hyosung V-Twins.
📦 What’s Included: 8x Stainless Bolts (Covers both Top Diaphragm Caps).

💡 MAINTENANCE WIN: If you’re cleaning your carbs or tuning your needle height, swapping to stainless hex bolts is the smartest “future-proofing” mod you can do.

Description

Let’s be honest: the standard OEM diaphragm cover bolts are a weak point. Made of soft mild steel, they frequently seize, rust, and round off the moment you try to service your slides. This “Maintenance Reality” turns a simple 10-minute job into a nightmare. Our UK-sourced A4 Stainless kit provides the definitive upgrade, offering high-tensile strength and a highly polished finish that resists road salt and engine heat for years to come.

💎 Performance with the “Shiny” Look!

Beyond the visual “bling” of polished stainless, the HEX socket head allows you to apply precise torque without slipping, protecting your delicate carburettor tops.

A4 Marine Grade The gold standard for rust-proof hardware.	Hex Drive Use an Allen key for safer, easier maintenance.
Precision Fit Matches OEM 13385HG5100 specifications exactly.	UK Manufactured Quality hardware sourced from the domestic supply chain.

📜 Confirmed Fitment Guide

✅ FITS: Hyosung GT125, GT125R, GT250, GT250R, GV125, GV250.
📅 YEARS: All carburetted years (GV125 up to 2017).
📦 NOTE: 8 bolts included—enough for a full carb overhaul.

💡 RECOMMENDED PAIRING:
Don’t stop at the tops! Refresh your entire carb setup with our Stainless Float Bowl Bolt Kits for a total “Bling & Bolt” overhaul. View Carb Hardware here.

🔧 Install Tips

Anti-Seize: Apply a tiny dab of copper grease to the threads to ensure they remain easy to remove for the next 10 years.
Criss-Cross Pattern: Tighten the bolts gradually in a diagonal pattern. This ensures the diaphragm cover seats flat and prevents vacuum leaks.
Inspect Seals: While the covers are off, check your rubber diaphragms for pin-holes or tears.
Tutorials: Need tuning advice? Visit the HyoRiders Tech Guides.

📧 FITMENT QUESTIONS? Email us or join the conversation on the HyoRiders Forums.